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Pi ( π ) - used in geometry: ratio of cirle's circumferenct to diameter.

Theta (θ) - symbol used in trigonometry, to indicate an angle measurement in degrees.

Sigma (Σ) - used in math for summation of a series.

Delta (Δ) - used to indicate a change in something.

There may be others that I haven't listed. There are many more Greek letters used in the different science fields. Hope that helps.

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13y ago

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